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Q&A biologically or anatomically is there a problem with this type of double mouth or jaws?

i am not talking about xenomorph or moray eel type of jaws or multiple mouth or lower jaw inside the mouth. but this type of mouth/jaws or i called it double chin jaws where the chin also work as ...

5 answers  ·  posted 4y ago by Li Jun‭  ·  last activity 4y ago by Li Jun‭